In order to provide high reliability, advanced RF mixer' packaging Strip is used.Shipping overseas is convenient since the mixer RF is packed in 12-CLCC Exposed Pad.There are 12 pins on this RF mix.Try searching with HMC558 to find RF mixer variants.The mount is attached to Surface Mount.
HMC558ALC3B Features
Packed in 12-CLCC Exposed Pad 12 pins
HMC558ALC3B Applications
There are a lot of Analog Devices Inc. HMC558ALC3B RF Mixers applications.